I am running two 10" MTX 5500 subs in custom made boxes off of a Rocford Fosgate 300I 2 channel amp (150 watts per channel). The boxes are smaller than what the manufacturer recommends, but I can't afford the space with a 197. The box fits perfectly between the kick plate and the bow seat on the drivers side. Under the passengers seat my amps and other sub take up a little room, but it isn't too bad.

I am going to be redoing both sub enclosures this spring trying to get the manufacturers recommend volume inside the enclosures and still get them to fit in my 197.